The terminal dashboard shows the same three KPI figures as Home #2884

This is the parity ask from review on pull #2878, split out so that pull can land on its own.

Done looks like

• [ ] src/tui/screens/dashboard.ts shows the three figures Home's KPI row shows, with the same words, read from the same readKpis.
• [ ] Non-admins see only what Home shows them.
• [ ] A test renders the dashboard and fails without the new line.
• [ ] Before pushing, run bun x tsc --noEmit and the dashboard and KPI tests.

Done on main already, waiting for you to close it: cdede41f1219409572612456625b2c6d0e9334c7

Closed: already done on main in cdede41.